The word-part “-tule” has been reinterpreted as the word “jewel”. Only five or so Google web cites, but they look firm. [From Arnold Zwicky, who posted a duplicate of this entry just seconds after Ben posted his. As Ben said on ADS-L: Just think, if this had been noted on Language Log a few years ago, we might all be referring to “pus jewels” instead of “eggcorns”…]